Reconstruction target.
Our loss function compute mean absolute error between the original sequence \(\mathbf {S}^i_j\)  and reconstructed sequence \(\hat{\mathbf {S}}^i_j\) .
Kindly note that we only compute loss over the masked patches, which is in line with other pre-training models [1]}, [2]}. Moreover, all these operations are computed in parallel for all time series \(i\) .
